/* * arch/mips/lib/console.c * * Copyright (C) 1994 by Waldorf Electronic, * written by Ralf Baechle and Andreas Busse * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file COPYING in the main directory of this archive for * more details. * * FIXME: This file is hacked to be hardwired for the Deskstation *        Only thought as a debugging console output.  It's as inefficient *        as a piece of code can be but probably a good piece of code to *        implement a preliminary console for a new target. */#include <linux/tty.h>#include <asm/bootinfo.h>static unsigned int size_x;static unsigned int size_y;static unsigned short cursor_x;static unsigned short cursor_y;static volatile unsigned short *vram_addr;static int console_needs_init = 1;extern struct screen_info screen_info;/* ---------------------------------------------------------------------- * init_console() * ---------------------------------------------------------------------- */void init_console(void){  size_x = 80;  size_y = 25;  cursor_x = 0;  cursor_y = 0;  vram_addr = (unsigned short *)0xb00b8000;  console_needs_init = 0;}voidset_size_x(unsigned int x){  size_x = x;}voidset_size_y(unsigned int y){  size_y = y;}voidset_vram(unsigned short *vram){  vram_addr = vram;}voidset_crsr(unsigned int x, unsigned int y){  cursor_x = x;  cursor_y = y;}voidprint_char(unsigned int x, unsigned int y, unsigned char c){  volatile unsigned short *caddr;  caddr = vram_addr + (y * size_x) + x;  *caddr = (*caddr & 0xff00) | 0x0f00 | (unsigned short) c;}static voidscroll(void){  volatile unsigned short *caddr;  register int i;  caddr = vram_addr;  for(i=0; i<size_x * (size_y-1); i++)    *(caddr++) = *(caddr + size_x);  /* blank last line */  caddr = vram_addr + (size_x * (size_y-1));  for(i=0; i<size_x; i++)    *(caddr++) = (*caddr & 0xff00) | (unsigned short) ' ';}void print_string(const unsigned char *str){  unsigned char c;  if (console_needs_init)    init_console();  while((c = *str++))    switch(c)      {      case '\n':	cursor_x = 0;	cursor_y++;	if(cursor_y == size_y)	  {	    scroll();	    cursor_y = size_y - 1;	  }	break;      default:	print_char(cursor_x, cursor_y, c);	cursor_x++;	if(cursor_x == size_x)	  {	    cursor_x = 0;	    cursor_y++;	    if(cursor_y == size_y)	      {		scroll();		cursor_y = size_y - 1;	      }	  }	break;      }}/* end of file */